<template>
  <div id="root">
    <!-- 绑定class样式--字符串写法，适用于：样式的类名不确定，需要动态指定 -->
    <div class="basic" :class="mood" @click="changeMood">{{name}}</div> <br/><br/>

    <!-- 绑定class样式--数组写法，适用于：要绑定的样式个数不确定、名字也不确定 -->
    <div class="basic" :class="classArr">{{name}}</div> <br/><br/>

    <!-- 绑定class样式--对象写法，适用于：要绑定的样式个数确定、名字也确定，但要动态决定用不用 -->
    <div class="basic" :class="classObj">{{name}}</div> <br/><br/>

    <!-- 绑定style样式--对象写法 -->
    <div class="basic" :style="styleObj">{{name}}</div> <br/><br/>

    <!-- 绑定style样式--数组写法 -->
    <div class="basic" :style="styleArr">{{name}}</div>
  </div>
</template>

<script>
export default {
  name: "BangDingYangShi",
  data() {
    return {
      name: '清华大学',
      mood: 'normal',
      classArr: ['atguigu1','atguigu2','atguigu2'],
      classObj: {
        atguigu1: false,
        atguigu2: false,
      },
      styleObj: {
        fontSize: '40px',
        color: 'red',
      },
      styleObj2: {
        backgroundColor: 'orange'
      },
      styleArr:[
        {
          fontSize: '40px',
          color: 'blue',
        },
        {
          backgroundColor: 'gray'
        }
      ]
    }
  },
  methods: {
    changeMood() {
      const arr = ['happpy', 'sad', 'normal']
      const index = Math.floor(Math.random()*3)
      this.mood = arr[index]
    }
  }
}
</script>

<style scoped>
.basic{
  width: 400px;
  height: 100px;
  border: 1px solid black;
}
.happy{
  border: 4px solid red;;
  background-color: rgba(255, 255, 0, 0.644);
  background: linear-gradient(30deg,yellow,pink,orange,yellow);
}
.sad{
  border: 4px dashed rgb(2, 197, 2);
  background-color: gray;
}
.normal{
  background-color: skyblue;
}

.atguigu1{
  background-color: yellowgreen;
}
.atguigu2{
  font-size: 30px;
  text-shadow:2px 2px 10px red;
}
.atguigu3{
  border-radius: 20px;
}
</style>
